blob: 204106b72d2418649974cfb91aeae9cc2df693bc [file] [log] [blame]
/*
* ADIS16201 Programmable Digital Vibration Sensor driver
*
* Copyright 2010 Analog Devices Inc.
*
* Licensed under the GPL-2 or later.
*/
#include <linux/delay.h>
#include <linux/mutex.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/spi/spi.h>
#include <linux/slab.h>
#include <linux/sysfs.h>
#include <linux/module.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/buffer.h>
#include "adis16201.h"
enum adis16201_chan {
in_supply,
temp,
accel_x,
accel_y,
incli_x,
incli_y,
in_aux,
};
/**
* adis16201_spi_write_reg_8() - write single byte to a register
* @dev: device associated with child of actual device (iio_dev or iio_trig)
* @reg_address: the address of the register to be written
* @val: the value to write
**/
static int adis16201_spi_write_reg_8(struct iio_dev *indio_dev,
u8 reg_address,
u8 val)
{
int ret;
struct adis16201_state *st = iio_priv(indio_dev);
mutex_lock(&st->buf_lock);
st->tx[0] = ADIS16201_WRITE_REG(reg_address);
st->tx[1] = val;
ret = spi_write(st->us, st->tx, 2);
mutex_unlock(&st->buf_lock);
return ret;
}
/**
* adis16201_spi_write_reg_16() - write 2 bytes to a pair of registers
* @indio_dev: iio device associated with child of actual device
* @reg_address: the address of the lower of the two registers. Second register
* is assumed to have address one greater.
* @val: value to be written
**/
static int adis16201_spi_write_reg_16(struct iio_dev *indio_dev,
u8 lower_reg_address,
u16 value)
{
int ret;
struct spi_message msg;
struct adis16201_state *st = iio_priv(indio_dev);
struct spi_transfer xfers[] = {
{
.tx_buf = st->tx,
.bits_per_word = 8,
.len = 2,
.cs_change = 1,
}, {
.tx_buf = st->tx + 2,
.bits_per_word = 8,
.len = 2,
},
};
mutex_lock(&st->buf_lock);
st->tx[0] = ADIS16201_WRITE_REG(lower_reg_address);
st->tx[1] = value & 0xFF;
st->tx[2] = ADIS16201_WRITE_REG(lower_reg_address + 1);
st->tx[3] = (value >> 8) & 0xFF;
spi_message_init(&msg);
spi_message_add_tail(&xfers[0], &msg);
spi_message_add_tail(&xfers[1], &msg);
ret = spi_sync(st->us, &msg);
mutex_unlock(&st->buf_lock);
return ret;
}
/**
* adis16201_spi_read_reg_16() - read 2 bytes from a 16-bit register
* @indio_dev: iio device associated with child of actual device
* @reg_address: the address of the lower of the two registers. Second register
* is assumed to have address one greater.
* @val: somewhere to pass back the value read
**/
static int adis16201_spi_read_reg_16(struct iio_dev *indio_dev,
u8 lower_reg_address,
u16 *val)
{
struct spi_message msg;
struct adis16201_state *st = iio_priv(indio_dev);
int ret;
struct spi_transfer xfers[] = {
{
.tx_buf = st->tx,
.bits_per_word = 8,
.len = 2,
.cs_change = 1,
.delay_usecs = 20,
}, {
.rx_buf = st->rx,
.bits_per_word = 8,
.len = 2,
.delay_usecs = 20,
},
};
mutex_lock(&st->buf_lock);
st->tx[0] = ADIS16201_READ_REG(lower_reg_address);
st->tx[1] = 0;
spi_message_init(&msg);
spi_message_add_tail(&xfers[0], &msg);
spi_message_add_tail(&xfers[1], &msg);
ret = spi_sync(st->us, &msg);
if (ret) {
dev_err(&st->us->dev, "problem when reading 16 bit register 0x%02X",
lower_reg_address);
goto error_ret;
}
*val = (st->rx[0] << 8) | st->rx[1];
error_ret:
mutex_unlock(&st->buf_lock);
return ret;
}
static int adis16201_reset(struct iio_dev *indio_dev)
{
int ret;
struct adis16201_state *st = iio_priv(indio_dev);
ret = adis16201_spi_write_reg_8(indio_dev,
ADIS16201_GLOB_CMD,
ADIS16201_GLOB_CMD_SW_RESET);
if (ret)
dev_err(&st->us->dev, "problem resetting device");
return ret;
}
int adis16201_set_irq(struct iio_dev *indio_dev, bool enable)
{
int ret = 0;
u16 msc;
ret = adis16201_spi_read_reg_16(indio_dev, ADIS16201_MSC_CTRL, &msc);
if (ret)
goto error_ret;
msc |= ADIS16201_MSC_CTRL_ACTIVE_HIGH;
msc &= ~ADIS16201_MSC_CTRL_DATA_RDY_DIO1;
if (enable)
msc |= ADIS16201_MSC_CTRL_DATA_RDY_EN;
else
msc &= ~ADIS16201_MSC_CTRL_DATA_RDY_EN;
ret = adis16201_spi_write_reg_16(indio_dev, ADIS16201_MSC_CTRL, msc);
error_ret:
return ret;
}
static int adis16201_check_status(struct iio_dev *indio_dev)
{
u16 status;
int ret;
ret = adis16201_spi_read_reg_16(indio_dev,
ADIS16201_DIAG_STAT, &status);
if (ret < 0) {
dev_err(&indio_dev->dev, "Reading status failed\n");
goto error_ret;
}
ret = status & 0xF;
if (ret)
ret = -EFAULT;
if (status & ADIS16201_DIAG_STAT_SPI_FAIL)
dev_err(&indio_dev->dev, "SPI failure\n");
if (status & ADIS16201_DIAG_STAT_FLASH_UPT)
dev_err(&indio_dev->dev, "Flash update failed\n");
if (status & ADIS16201_DIAG_STAT_POWER_HIGH)
dev_err(&indio_dev->dev, "Power supply above 3.625V\n");
if (status & ADIS16201_DIAG_STAT_POWER_LOW)
dev_err(&indio_dev->dev, "Power supply below 3.15V\n");
error_ret:
return ret;
}
static int adis16201_self_test(struct iio_dev *indio_dev)
{
int ret;
ret = adis16201_spi_write_reg_16(indio_dev,
ADIS16201_MSC_CTRL,
ADIS16201_MSC_CTRL_SELF_TEST_EN);
if (ret) {
dev_err(&indio_dev->dev, "problem starting self test");
goto err_ret;
}
ret = adis16201_check_status(indio_dev);
err_ret:
return ret;
}
static int adis16201_initial_setup(struct iio_dev *indio_dev)
{
int ret;
struct device *dev = &indio_dev->dev;
/* Disable IRQ */
ret = adis16201_set_irq(indio_dev, false);
if (ret) {
dev_err(dev, "disable irq failed");
goto err_ret;
}
/* Do self test */
ret = adis16201_self_test(indio_dev);
if (ret) {
dev_err(dev, "self test failure");
goto err_ret;
}
/* Read status register to check the result */
ret = adis16201_check_status(indio_dev);
if (ret) {
adis16201_reset(indio_dev);
dev_err(dev, "device not playing ball -> reset");
msleep(ADIS16201_STARTUP_DELAY);
ret = adis16201_check_status(indio_dev);
if (ret) {
dev_err(dev, "giving up");
goto err_ret;
}
}
err_ret:
return ret;
}
static u8 adis16201_addresses[7][2] = {
[in_supply] = { ADIS16201_SUPPLY_OUT, },
[temp] = { ADIS16201_TEMP_OUT },
[accel_x] = { ADIS16201_XACCL_OUT, ADIS16201_XACCL_OFFS },
[accel_y] = { ADIS16201_YACCL_OUT, ADIS16201_YACCL_OFFS },
[in_aux] = { ADIS16201_AUX_ADC },
[incli_x] = { ADIS16201_XINCL_OUT },
[incli_y] = { ADIS16201_YINCL_OUT },
};
static int adis16201_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2,
long mask)
{
int ret;
int bits;
u8 addr;
s16 val16;
switch (mask) {
case IIO_CHAN_INFO_RAW:
mutex_lock(&indio_dev->mlock);
addr = adis16201_addresses[chan->address][0];
ret = adis16201_spi_read_reg_16(indio_dev, addr, &val16);
if (ret) {
mutex_unlock(&indio_dev->mlock);
return ret;
}
if (val16 & ADIS16201_ERROR_ACTIVE) {
ret = adis16201_check_status(indio_dev);
if (ret) {
mutex_unlock(&indio_dev->mlock);
return ret;
}
}
val16 = val16 & ((1 << chan->scan_type.realbits) - 1);
if (chan->scan_type.sign == 's')
val16 = (s16)(val16 <<
(16 - chan->scan_type.realbits)) >>
(16 - chan->scan_type.realbits);
*val = val16;
mutex_unlock(&indio_dev->mlock);
return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
switch (chan->type) {
case IIO_VOLTAGE:
*val = 0;
if (chan->channel == 0)
*val2 = 1220;
else
*val2 = 610;
return IIO_VAL_INT_PLUS_MICRO;
case IIO_TEMP:
*val = 0;
*val2 = -470000;
return IIO_VAL_INT_PLUS_MICRO;
case IIO_ACCEL:
*val = 0;
*val2 = 462500;
return IIO_VAL_INT_PLUS_MICRO;
case IIO_INCLI:
*val = 0;
*val2 = 100000;
return IIO_VAL_INT_PLUS_MICRO;
default:
return -EINVAL;
}
break;
case IIO_CHAN_INFO_OFFSET:
*val = 25;
return IIO_VAL_INT;
case IIO_CHAN_INFO_CALIBBIAS:
switch (chan->type) {
case IIO_ACCEL:
bits = 12;
break;
case IIO_INCLI:
bits = 9;
break;
default:
return -EINVAL;
};
mutex_lock(&indio_dev->mlock);
addr = adis16201_addresses[chan->address][1];
ret = adis16201_spi_read_reg_16(indio_dev, addr, &val16);
if (ret) {
mutex_unlock(&indio_dev->mlock);
return ret;
}
val16 &= (1 << bits) - 1;
val16 = (s16)(val16 << (16 - bits)) >> (16 - bits);
*val = val16;
mutex_unlock(&indio_dev->mlock);
return IIO_VAL_INT;
}
return -EINVAL;
}
static int adis16201_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int val,
int val2,
long mask)
{
int bits;
s16 val16;
u8 addr;
switch (mask) {
case IIO_CHAN_INFO_CALIBBIAS:
switch (chan->type) {
case IIO_ACCEL:
bits = 12;
break;
case IIO_INCLI:
bits = 9;
break;
default:
return -EINVAL;
};
val16 = val & ((1 << bits) - 1);
addr = adis16201_addresses[chan->address][1];
return adis16201_spi_write_reg_16(indio_dev, addr, val16);
}
return -EINVAL;
}
static struct iio_chan_spec adis16201_channels[] = {
{
.type = IIO_VOLTAGE,
.indexed = 1,
.channel = 0,
.extend_name = "supply",
.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
IIO_CHAN_INFO_SCALE_SEPARATE_BIT,
.address = in_supply,
.scan_index = ADIS16201_SCAN_SUPPLY,
.scan_type = {
.sign = 'u',
.realbits = 12,
.storagebits = 16,
},
}, {
.type = IIO_TEMP,
.indexed = 1,
.channel = 0,
.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
IIO_CHAN_INFO_SCALE_SEPARATE_BIT |
IIO_CHAN_INFO_OFFSET_SEPARATE_BIT,
.address = temp,
.scan_index = ADIS16201_SCAN_TEMP,
.scan_type = {
.sign = 'u',
.realbits = 12,
.storagebits = 16,
},
}, {
.type = IIO_ACCEL,
.modified = 1,
.channel2 = IIO_MOD_X,
.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
IIO_CHAN_INFO_SCALE_SHARED_BIT |
IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT,
.address = accel_x,
.scan_index = ADIS16201_SCAN_ACC_X,
.scan_type = {
.sign = 's',
.realbits = 14,
.storagebits = 16,
},
}, {
.type = IIO_ACCEL,
.modified = 1,
.channel2 = IIO_MOD_Y,
.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
IIO_CHAN_INFO_SCALE_SHARED_BIT |
IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT,
.address = accel_y,
.scan_index = ADIS16201_SCAN_ACC_Y,
.scan_type = {
.sign = 's',
.realbits = 14,
.storagebits = 16,
},
}, {
.type = IIO_VOLTAGE,
.indexed = 1,
.channel = 1,
.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
IIO_CHAN_INFO_SCALE_SEPARATE_BIT,
.address = in_aux,
.scan_index = ADIS16201_SCAN_AUX_ADC,
.scan_type = {
.sign = 'u',
.realbits = 12,
.storagebits = 16,
},
}, {
.type = IIO_INCLI,
.modified = 1,
.channel2 = IIO_MOD_X,
.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
IIO_CHAN_INFO_SCALE_SHARED_BIT |
IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT,
.address = incli_x,
.scan_index = ADIS16201_SCAN_INCLI_X,
.scan_type = {
.sign = 's',
.realbits = 14,
.storagebits = 16,
},
}, {
.type = IIO_INCLI,
.modified = 1,
.channel2 = IIO_MOD_Y,
.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
IIO_CHAN_INFO_SCALE_SHARED_BIT |
IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT,
.address = incli_y,
.scan_index = ADIS16201_SCAN_INCLI_Y,
.scan_type = {
.sign = 's',
.realbits = 14,
.storagebits = 16,
},
},
IIO_CHAN_SOFT_TIMESTAMP(7)
};
static const struct iio_info adis16201_info = {
.read_raw = &adis16201_read_raw,
.write_raw = &adis16201_write_raw,
.driver_module = THIS_MODULE,
};
static int __devinit adis16201_probe(struct spi_device *spi)
{
int ret;
struct adis16201_state *st;
struct iio_dev *indio_dev;
/* setup the industrialio driver allocated elements */
indio_dev = iio_device_alloc(sizeof(*st));
if (indio_dev == NULL) {
ret = -ENOMEM;
goto error_ret;
}
st = iio_priv(indio_dev);
/* this is only used for removal purposes */
spi_set_drvdata(spi, indio_dev);
st->us = spi;
mutex_init(&st->buf_lock);
indio_dev->name = spi->dev.driver->name;
indio_dev->dev.parent = &spi->dev;
indio_dev->info = &adis16201_info;
indio_dev->channels = adis16201_channels;
indio_dev->num_channels = ARRAY_SIZE(adis16201_channels);
indio_dev->modes = INDIO_DIRECT_MODE;
ret = adis16201_configure_ring(indio_dev);
if (ret)
goto error_free_dev;
ret = iio_buffer_register(indio_dev,
adis16201_channels,
ARRAY_SIZE(adis16201_channels));
if (ret) {
printk(KERN_ERR "failed to initialize the ring\n");
goto error_unreg_ring_funcs;
}
if (spi->irq) {
ret = adis16201_probe_trigger(indio_dev);
if (ret)
goto error_uninitialize_ring;
}
/* Get the device into a sane initial state */
ret = adis16201_initial_setup(indio_dev);
if (ret)
goto error_remove_trigger;
ret = iio_device_register(indio_dev);
if (ret < 0)
goto error_remove_trigger;
return 0;
error_remove_trigger:
adis16201_remove_trigger(indio_dev);
error_uninitialize_ring:
iio_buffer_unregister(indio_dev);
error_unreg_ring_funcs:
adis16201_unconfigure_ring(indio_dev);
error_free_dev:
iio_device_free(indio_dev);
error_ret:
return ret;
}
static int adis16201_remove(struct spi_device *spi)
{
struct iio_dev *indio_dev = spi_get_drvdata(spi);
iio_device_unregister(indio_dev);
adis16201_remove_trigger(indio_dev);
iio_buffer_unregister(indio_dev);
adis16201_unconfigure_ring(indio_dev);
iio_device_free(indio_dev);
return 0;
}
static struct spi_driver adis16201_driver = {
.driver = {
.name = "adis16201",
.owner = THIS_MODULE,
},
.probe = adis16201_probe,
.remove = __devexit_p(adis16201_remove),
};
module_spi_driver(adis16201_driver);
MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
MODULE_DESCRIPTION("Analog Devices ADIS16201 Programmable Digital Vibration Sensor driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("spi:adis16201");